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Rapid X-ray Variability of Seyfert 1 Galaxies
S. Vaughan, A. C. Fabian, K. Iwasawa
The rapid and seemingly random fluctuations in X-ray luminosity of Seyfert galaxies provided early support for the standard model in which Seyferts are powered by a supermassive bl…
Multi-epoch Spectroscopy of IY UMa: Quiescence, Rise, Normal Outburst & Superoutburst
Daniel J. Rolfe, Carole A. Haswell, Timothy M. C. Abbott +3
We exploit rare observations covering the time before and during a normal outburst in the deeply-eclipsing SU UMa system IY UMa to study the dramatic changes in the accretion flow…
SSSPM J1444-2019: an extremely high proper motion, ultracool subdwarf
R. -D. Scholz, N. Lodieu, M. J. McCaughrean
We present the discovery of a new extreme high proper motion object (3.5 arcsec/year) which we classify as an ultracool subdwarf with [M/H] = -0.5. It has a formal spectral type of…
Subluminous O stars from the ESO Supernova Progenitor Survey - Observation versus Theory
A. Stroeer, U. Heber, T. Lisker +2
The ESO Supernova Progenitor Survey (SPY) has identified 58 (mostly helium-rich) subluminous O stars. We use the Balmer line strength to distinguish sdO from He-sdO (no Balmer line…
The HI Parkes Zone of Avoidance Survey: the Northern Extension
J. L. Donley, L. Staveley-Smith, R. C. Kraan-Korteweg +6
We present the results of the northern extension of the HI Parkes Zone of Avoidance Survey, a blind HI survey utilizing the multibeam receiver on the Parkes 64-m telescope. In the…
Studies of orbital parameters and pulse profile of the accreting millisecond pulsar XTE J1807-294
M. G. F. Kirsch, K. Mukerjee, M. G. Breitfellner +4
The accreting millisecond pulsar XTE J1807-294 was observed by XMM-Newton on March 22, 2003 after its discovery on February 21, 2003 by RXTE. The source was detected in its bright…